Add support for SPARC SunOS PIC:

	Add support for SPARC SunOS PIC:
	* config/tc-sparc.h (sparc_pic_code): Always declare, not just
	when OBJ_ELF.
	(TC_RELOC_RTSYM_LOC_FIXUP): Define when OBJ_AOUT.
	(tc_fix_adjustable): New definition for OBJ_AOUT.
	* config/tc-sparc.c (sparc_pic_code): Always define, not just when
	OBJ_ELF.
	(md_apply_fix): Adjust reloc addend for OBJ_AOUT and PIC.  In
	BFD_RELOC_32_PCREL_S2 case, don't increment val for an external
	symbol when PIC.
	(tc_gen_reloc): Generate different PIC relocs when OBJ_AOUT, as
	well as when OBJ_ELF.
	(md_shortopts): If OBJ_AOUT, include `k'.
	(md_parse_option): If OBJ_AOUT, handle 'k'.
	(md_show_usage): Mention -k if OBJ_AOUT, and -KPIC if OBJ_ELF.
	(md_pcrel_from): Don't add in size for an external symbol when
	PIC.